From patchwork Mon Jul 12 06:10:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 476308 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D189C07E9C for ; Mon, 12 Jul 2021 06:23:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 683E96101E for ; Mon, 12 Jul 2021 06:23:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235318AbhGLG0b (ORCPT ); Mon, 12 Jul 2021 02:26:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:47330 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233517AbhGLGZm (ORCPT ); Mon, 12 Jul 2021 02:25:42 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2913561106; Mon, 12 Jul 2021 06:22:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626070966; bh=L+BA82XUhqQv2PJnE1acFbYimkXnO4bUdVOMrVrR2T4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=px5YUCQabAKrtHwoF5zp+FkB8pZXUWRsPt1iMVVgsTcDXfM3DTkgW4ewzz4Uk+TV+ CpiU4hwv5sZ0U7D5cgGPu+eucnAo+G1xRGxgVmMnAEdg/hnga/o/vc6p0ejPLbtq0I aUlEgACSyh75T3MiawHvb49HtC2rYXj5oNKxpPMw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Skripkin , "David S. Miller" , Sasha Levin Subject: [PATCH 5.4 218/348] net: ethernet: ezchip: fix UAF in nps_enet_remove Date: Mon, 12 Jul 2021 08:10:02 +0200 Message-Id: <20210712060730.490942478@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060659.886176320@linuxfoundation.org> References: <20210712060659.886176320@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pavel Skripkin [ Upstream commit e4b8700e07a86e8eab6916aa5c5ba99042c34089 ] priv is netdev private data, but it is used after free_netdev(). It can cause use-after-free when accessing priv pointer. So, fix it by moving free_netdev() after netif_napi_del() call. Fixes: 0dd077093636 ("NET: Add ezchip ethernet driver") Signed-off-by: Pavel Skripkin Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/ezchip/nps_enet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c index 815fb62c4b02..026a3ec19b6e 100644 --- a/drivers/net/ethernet/ezchip/nps_enet.c +++ b/drivers/net/ethernet/ezchip/nps_enet.c @@ -645,8 +645,8 @@ static s32 nps_enet_remove(struct platform_device *pdev) struct nps_enet_priv *priv = netdev_priv(ndev); unregister_netdev(ndev); - free_netdev(ndev); netif_napi_del(&priv->napi); + free_netdev(ndev); return 0; }